fix: add air block and fix transparency on images

src/components/canvas/Blocks.tsx

@@ -85,6 +85,7 @@ function Blocks({ blocks, setBlocks, missingTexture, textures, solidTextures, im
 
 			for (let i = 0; i < imageData.data.length; i += 4) {
 				const block = findBlockFromRgb(blockData, imageData.data[i], imageData.data[i + 1], imageData.data[i + 2], imageData.data[i + 3]);
+				if (block == "air") continue;
 
 				const x = Math.floor((i / 4) % imageData.width);
 				const y = Math.floor(i / 4 / imageData.width);

src/components/canvas/Canvas.tsx

@@ -109,19 +109,9 @@ function Canvas() {
 			return radiusBlocks;
 		};
 
-		switch (tool) {
-			case "pencil": {
-				const newBlocks = getBlocksWithinRadius(mouseCoords.x, mouseCoords.y, radius, selectedBlock);
-				const mergedBlocks = blocks.filter((block) => {
-					return !newBlocks.some((newBlock) => block.x === newBlock.x && block.y === newBlock.y);
-				});
-
-				setBlocks([...mergedBlocks, ...newBlocks]);
-				break;
-			}
-			case "eraser": {
+		const eraseTool = () => {
 			// Fixes Infinity and NaN errors
-				if (blocks.length == 1) break;
+			if (blocks.length == 1) return;
 
 			const halfSize = Math.floor(radius / 2);
 			const startX = mouseCoords.x - (radius % 2 === 0 ? 0 : halfSize);
@@ -133,6 +123,25 @@ function Canvas() {
 			});
 
 			setBlocks(updated);
+		};
+
+		switch (tool) {
+			case "pencil": {
+				if (selectedBlock == "air") {
+					eraseTool();
+					break;
+				}
+
+				const newBlocks = getBlocksWithinRadius(mouseCoords.x, mouseCoords.y, radius, selectedBlock);
+				const mergedBlocks = blocks.filter((block) => {
+					return !newBlocks.some((newBlock) => block.x === newBlock.x && block.y === newBlock.y);
+				});
+
+				setBlocks([...mergedBlocks, ...newBlocks]);
+				break;
+			}
+			case "eraser": {
+				eraseTool();
 				break;
 			}
 		}

src/components/tool-settings/Replace.tsx

@@ -25,7 +25,12 @@ function Replace() {
 	};
 
 	const onClickReplace = () => {
-		setBlocks((prevBlocks) => prevBlocks.map((block) => (block.name === block1 ? { ...block, name: block2 } : block)));
+		// If block2 name is air, delete the block instead.
+		setBlocks((prevBlocks) =>
+			prevBlocks
+				.map((block) => (block.name === block1 ? (block2 === "air" ? null : { ...block, name: block2 }) : block))
+				.filter((block) => block !== null)
+		);
 	};
 
 	useEffect(() => {

src/context/Textures.tsx

@@ -28,19 +28,22 @@ export const TexturesProvider = ({ children }: Props) => {
 
 	useEffect(() => {
 		// Load missing texture
-		const baseTexture = new PIXI.BaseTexture(
+		const missingBaseTexture = new PIXI.BaseTexture(
 			"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAIAAACQkWg2AAAAGUlEQVR42mPABX4w/MCKaKJhVMPgcOuoBgDZRfgBVl5QdQAAAABJRU5ErkJggg=="
 		);
-		setMissingTexture(new PIXI.Texture(baseTexture));
+		setMissingTexture(new PIXI.Texture(missingBaseTexture));
 
 		// Load textures
 		const sheet = new PIXI.Spritesheet(PIXI.BaseTexture.from("/blocks/spritesheet.png"), spritesheet);
 		sheet.parse().then((t) => {
-			setTextures(t);
+			// Add air texture
+			const airBaseTexture = new PIXI.BaseTexture("/blocks/air.png");
+
+			setTextures({ ...t, "air.png": new PIXI.Texture(airBaseTexture) });
 		});
 
 		// Load solid textures
-		const solidT: Record<string, PIXI.Texture> = {};
+		const solidTexturesCollection: Record<string, PIXI.Texture> = {};
 
 		const canvas = document.createElement("canvas");
 		canvas.width = 16;
@@ -58,10 +61,10 @@ export const TexturesProvider = ({ children }: Props) => {
 
 			const baseTexture = new PIXI.BaseTexture(image);
 			const texture = new PIXI.Texture(baseTexture);
-			solidT[blockName] = texture;
+			solidTexturesCollection[blockName] = texture;
 		});
 
-		setSolidTextures(solidT);
+		setSolidTextures(solidTexturesCollection);
 		setLoading(false);
 	}, []);
 

src/data/blocks/data.json

@@ -1,4 +1,10 @@
 {
+	"air": {
+		"name": "Air",
+		"version": 1000,
+		"id": ["air", 0],
+		"color": [0, 0, 0, 0]
+	},
 	"acacia_log": {
 		"name": "Acacia Log",
 		"version": 1072,